How to Make Copy of Scene but change some things
Have you tried making an collection?
A - to select all, shift+D to duplicate, Ctrl+G to create new collection that is NOT Linked to the active scene.
See Blender Guru's Doughnut tutorial Part 5, Level 1 timestamp 2:07
https://www.youtube.com/watch?v=6OTX3ZdYvEA&amp;list=PLjEaoINr3zgEq0u2MzVgAaHEBt--xLB6U&amp;index=6
https://docs.blender.org/manual/en/latest/scene_layout/collections/collections.html

Too low rep to post as comment. Hope this helps.